Rectangular Etched
Why Silicon Wafers are circular?.?
Why are silicon wafers always circular in shape?. Is it because it has least wastage after etching the dies?. I see that we have a die, the edges of the circular wafer are always covered with partial dies. This is a lot of wastage, so why not the wafers be rectangular or squarish. I beleive there will be more wastage of die space if it is squarish/rectangle. Please confirm this.
If there is any other reason please let me know.
It is the way they are ultra-purified; a process called zone-melting. Cylindrical rods are the most efficient way to more evenly distribute the heat. Check out wikipedia.org
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